Maths Working Wall for Year 4 Top Set. Grid Method and Formal Written Multiplication. These flip charts are straight from my lesson, the students are familiar with them as I made them with them, for them. A great way to get a maths display up with minimal effort for maximum effect! Headings are done on coloured card and took about 5 minutes. Differentiation means that students can have a try at the tricker sums and have a model ready.